Long range quantum coherence, quantum & classical correlations in Heisenberg XX chain
| Autor: | Morad El Baz, Zakaria Mzaouali |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Statistics and Probability
Physics Quantum phase transition Quantum Physics Quantum discord FOS: Physical sciences Quantum entanglement Condensed Matter Physics 01 natural sciences 010305 fluids & plasmas Quantum spin chains symbols.namesake Pauli exclusion principle Quantum mechanics 0103 physical sciences symbols Pairwise comparison Quantum Physics (quant-ph) 010306 general physics Hamiltonian (quantum mechanics) Quantum |
| Zdroj: | Physica A: Statistical Mechanics and its Applications. 518:119-130 |
| ISSN: | 0378-4371 |
| DOI: | 10.1016/j.physa.2018.11.062 |
| Popis: | A comparative study of pairwise quantum coherence, quantum and classical correlations is addressed for non-nearest spin pairs of the 1D Heisenberg spin-$\frac{1}{2}$ XX chain. Following the Jordan-Wigner mapping, we diagonalise the hamiltonian of the chain and we check this procedure numerically as well. Using the "Pauli basis expansion" formalism we get the pairwise quantities studied in this work at any distance. We then, show the role of quantum correlations in revealing quantum phase transitions, the robustness of quantum discord to the temperature and the dominance of quantum correlations over their classical counterpart in the magnetic and thermal interval in quantum spin chains. We conclude the paper by shedding light from a resource-driven point of view on the new born quantity "quantum coherence" where we discuss its role in detecting quantum phase transitions being a long-range quantity, and how it outclasses the usual quantum correlations measures in the robustness against the temperature, which indicates potential uses in the framework of quantum information processing. 14 pages, 9 figures |
| Databáze: | OpenAIRE |
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